It has to be a memory problem,then, Try to trim the fat from the OLED library: use less fonts (if you are using more than one right now), or even keep only the glyphs that you are actually using in your application, e.g. all the digits and just the letters to form the words you are actually displaying; get rid of unused symbols (&, £, !, {, }, @, things like that). If it isn't already done, drop Strings and their dynamic memory usage.
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